It's OK. No great shakes, but a solid add to the system.
The only problem is in SWLIHN charms. Almost all the Charms have the Native keyword for no discernably good reason. When asked about this, the author gave a reesponse (paraphrasing) that he did not want to think about Eclipses.
Other than that, it's good.
[3 of 5 Stars!]